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| PR:Q9YGS0 | iroquois-class homeodomain protein IRX-4 (chicken) | | |  | | |
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| PR:P78413 | iroquois-class homeodomain protein IRX-4 (human) | | |  | | |
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| PR:P78413-1 | iroquois-class homeodomain protein IRX-4 isoform h1 (human) | | |  | | |
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| PR:P78413-2 | iroquois-class homeodomain protein IRX-4 isoform h2 (human) | | |  | | |
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| PR:Q9QY61 | iroquois-class homeodomain protein IRX-4 (mouse) | | |  | | |